Conference Paper

Analyzing the earth conductivity and permittivity frequency dependence influence to electromagnetic transient phenomena

COPPE, Fed. Univ. of Rio de Janeiro
DOI: 10.1109/ICPST.2000.897132 Conference: Power System Technology, 2000. Proceedings. PowerCon 2000. International Conference on, Volume: 2
Source: IEEE Xplore

ABSTRACT In this article the quasi-modes model is used to observe the
influence, in electromagnetic transient phenomena, of considering a more
accurate representation of soil, taking into account the earth
conductivity and permittivity frequency dependence. For an actual 440 kV
three-phase transmission line the soil behavior is represented through a
unique real value of conductance and through a more accurate model,
considering its electromagnetic behavior

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    ABSTRACT: The paper discusses the basic aspects of modeling, simulation and optimization o f transmission lines, with emphasis in validity, applicability and limitations of some used pro- cedures, and some guidelines for development of new procedures. 1. INTRODUCTION In this paper we discuss the basic aspects of modeling, simulation and optimization of transmission lines. As the subject can not be systematically covered within a single paper, we have chosen some specific points, as examples, which we discuss with emphasis in validity, applicability and limitations of some used procedures, and some guide- lines for development of new procedures. Due to the vast bibliography about lines and its modeling, following the aim of this paper, we do not give a comprehensive list of references. We only indicate, also as examples, some refer- ences directly related with chosen specific points and the way they are presented. By no means, the choice of topics may be interpreted as a judgment of methodologies and procedures not dealt with in the paper. The topics related to transmission lines modeling, simula- tion and optimization cover : a. Physical evaluation of basic line parameters and associ- ated analytical, numeric, analogous or test procedures, and accuracy requirements, according to foreseen applications. b. Procedures to represent a line, considering its basic parameters and length, e. g. as seen from its terminals, and in a form adequate for the specific application. c. Modeling and simulation of a line inserted in a network and interacting with the behavior of other elements. d. Optimization of a line, according normal and transient operational constraints and effects, investment and opera- tional cost, reliability, service quality, people and equip- ment safety, ambient impact, effects of eventual deviations from foreseen operational requirements. In what concerns operational aspects and constraints, the following aspects must be taken into account: A. In what concerns electromagnetic behavior:
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    ABSTRACT: In this paper the influence of earth's conductivity and permittivity frequency dependence are evaluated when calculating transversal and longitudinal transmission lines' parameters directly from numerical integration of Carson's modified expressions. As an example of the importance of properly considering the frequency-dependent soil model, an actual 440 kV single three-phase transmission-line was represented, comparing the longitudinal and transversal parameters considering the earth's conductivity and permittivity frequency dependence soil model in relation to the common soil representation with a constant conductivity and permittivity that can be neglected assuming a low frequency approximation.
    Transmission and Distribution Conference and Exposition: Latin America (T&D-LA), 2010 IEEE/PES; 12/2010
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